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(No Model.)

J. OHAINE, A. DURAND &.P. 8. DE GHALIGNY.

PROCESS OF AND APPARATUS FOR COLORING PHOTOGRAPHS. No. 271,789.

Patented Feb. 6, 1883.

I mmmmm N, PETERS, Pwa-um w, Washingim; n. C.

UNITED STATES PATENT" OFFICE.

JOSEPH CHAINE, ARTHUR DURAND, AND FREDERIG SALLONIER DE GHALIGNY, OF LYONS, FRANCE.

PROCESS OF AND APPARATUS FOR COLORING PHOTOGRAPHS.

SPECIFICATTON forming part of Letters Patent No. 271,789, dated February 6, 1883. Application filed November 27, 1882. (No model.) Patented in France June 24, 1882, No. 149,778.

To all whom it may concern Be it known that we, Josnrrr CHAINE, AR- THUR DURAND, and Fnnnnero SALLONIER DE GHALIGNY, of Lyons, in the Republic of France, have invented a new and Improved Process of and Apparatus for GoloringPhotographs, of which the following is a specification, reference being had to the accompanying drawings.

Heretofore photography in color has been performed by the application of ordinary oilpainting to the backof a photographic proof which has been rendered transparent by any suitable means. Colored photographs thus obfrom the beginning of the process with the bath to the'end of the use of the furnace.

In the accompanying drawings, Figures 1.

and 2 are vertical sections at right angles to 7 each other of the bath, and Fig. 3 is a plan of the same. Figs. 4 and 5 are vertical sections atright angles to each other of the table, and Fig. 6 is a plan of the same. Figs. 7 and 8 are vertical sections at right angles to each other of the oven. Fig. 9 is a plan of the same, and Fig. 10 is an end view of the same. The bath consists of a rectangular box, A, having double walls and bottom, within which circulates a current of hot water, steam, hot air, or any hot gas, and is fitted with alid, B, furnished at its edge with a strip of indie-rubber, of which the margin makes a joint against the walls of the box.' This lid is attached to a shaft, D, working in bearings in supports E, provided on the-top of the box.

, To one of the extremities of the shaft D is keyed a lever, F, which serves to hold down the lid, and upon which is an adjustable weight, G, which, according as it is nearer to or farther from the shaft, exerts a greater or less pressure on the proof while it is being drawn from the bath between the front wall of the latter and the contiguous edge of the lid B. To prevent the loss of heat, the lid .13 is provided with a jacketing of felt, H, or of any other non-conducting substance, keptin place by an envelope, 1. Two cocks, J, permit the ingress and egress of hot water, steam, air, or

gas. Y j

The bath A is to contain the material which is to render the photographic proofs transparent, and the steam, hot air, or gas introduced into its double bottom and walls is to keep the said material liquid. After having remained a suitable time in the bath, the proof is withdrawn, care being taken that it passes between the rounded upper part of the front wall of the box and the india-rubber strip on the front edge of the lid in such manner as to take out with it the least possible quantity of theliqnid with which the proof is impregnated. From the bath the proof is taken to the table, Figs. 4, 5, and 6. This table is composed of a metallic box, A, closed in all parts and having its upper face horizontal and smooth, while the bottom is inclined in all directions to cause the convergence toward the lowest point of the products of condensation if it is heated with steam, or of the deposits if it is heated by hot water. This box Arests on an ordinary wooden table, B, of which the top is removed and replaced by the said box. -Two cocks, G, per-- The proof coming from the bath is placed upon this table, which, by the steam or hot air or gas in its interior, is kept ata suitable temperature to keep liquefied the surface of the liquid minutes the proof is in condition to receive the This liquid is re oil-painting which is to give it the colors, the 5 tones, andthe shades. After having received the oil-paintin g on its back, the proof is taken to the oven, Figs. 7, 8,9,10. This oven, which has double walls or a double envelope and is heated to a suitable temperature by means of I00 rial of which the photographic proofs are comsteam or hot air or gas admitted to said walls I or envelope, provides for the complete drying of the oil-painting in a very short time, and establishes by'a commencement of fusion the most intimate solidarity between the painting and the matter of which the photographic proof is composed. This oven, which may be of cylindrical form, has a double wall, B, within which the steam or hot air or gas circulates for heating the interior, and has an outer jacketing, O, of felt or other non-conducting material.

At each extremity of the oven are doors D, which may beopened and closed at will, and which, to prevent loss of heat, arejacketed internally and externally with non-conducting material.

In the interior of the oven are fixed horizontally tables E, of perforated sheet metal or wirecloth, forthe reception of the proofs to be dried.

For the escape of the volatile matters contained in the painting or in the photographic proofs, escape-pipes F are provided in the top of the oven, and to establish a current of air in the interior of the oven other tubes, G, are provided in the bottom thereof. I

If the oven is heated with hot water,it should enter the envelope Bor double walls at the top and leave at the bottom by pipes H, furnished with cocks. If heated by steam, hot air, or gas, the circulation should be reversed, ingress being at the bottom pipe and egress by the top one. It is in the oven that the proofs are dried, and that by a sutficient temperature the mateposed is softened to the point at which the painting mixes with it in such an intimate manner that the two are incorporated at the point of contact. It is this intimate mixture produced by the heat whichinsures the success of the process and produces the inalterability of the proofs and their absolutely complete insensibility to variations of temperature and climate. All that remains to be done to the proofs after their removal from the furnace is to pass them under a press and finish them by ordinary process.

Instead of the furnace described, any other drying apparatus furnished with means of heating and ventilation may be used.

What We claim as our invention, and desire to secure by Letters Patent, is

The process of fixing and .rendering unchangeable the colors of colored photographs, consisting in applying the transparent preparing material to the proofs in a heated bath and removing the surplus of such material therefrom on a heated table before the painting, and

then after the painting subjecting the proofs to a drying operation in a ventilated .oven, substantially as herein described.

' This specification'signed this 6th day of No-' 

